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Sounds like you're trying to scan a device but not using a correct authenticator (example being scanning a windows machine with a Linux SSH account). Verify the scan range that you are scanning this computer with includes an administrator account.

Yeah, that was just an example. Try this - delete the machine from inventory. Add a scan entry *only* for that machine. So the range would be just the single IP address. Use the admin account as the only scan account. Disable other scan ranges and do a scan using only this new range checked. What are the results?

This morning, I clicked on "manage accounts" and then on test... it said it succeeded, and then automatically re-added three machines to a new scan. When it was done I checked and that machine no longer had the red error banner, and the software inventory was up to date.

I'll add that to my "notes to self" to go through the motions of re-testing the accounts/credentials when something like this crops up. I skipped over it before because other computers were not getting the same error, so it couldn't have been an actual authentication issue... but it sort of was.